Posted by **Kim** on Wednesday, June 20, 2012 at 12:54pm.

A 230.0mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning the solution is 1.50M. What volume of solvent has evaporated from the 0.275 M solution?

a)42.2 mL

b)63.3 mL

c)187.8 mL

d)230 mL

e)272.2 mL

- General Chemistry -
**DrBob222**, Wednesday, June 20, 2012 at 1:27pm
How many moles do you hae ini the original sample? That is M x L = 0.275 x 0.230 = ?

You still have that number of moles in the sample after heating.

M = moles/L. You know M and moles, solve for L in the sample. Subtract from 0.230L to find the amount evaporated.

- General Chemistry -
**Anonymous**, Thursday, June 21, 2012 at 2:15am
Use formula M1 x V1 = M2 x V2

V2 = M1xV1/M2

V2 = 0.275M x 0.230L/1.50M = 0.0422L need to convert back to ml

0.0422L x 1000L/1mL = 42.2mL

A is the answer

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